All three angle pairs in the diagram you sent are same-side exterior angles. Same-side exterior angles are supplementary angles, meaning that their sum is 180 degrees.
Angle 1 and Angle 11: Same-side exterior angles
Same-side exterior angles are a pair of angles that lie on the same side of a transversal and outside of two parallel lines. They are formed when a transversal intersects two parallel lines. In the diagram you sent, Angle 1 and Angle 11 are same-side exterior angles.
Angle 1 and Angle 6: Same-side exterior angles
Angle 1 and Angle 6 are also same-side exterior angles. They lie on the same side of the transversal (line l) and outside of the two parallel lines (line m and line n).
Angle 12 and Angle 15: Same-side exterior angles
Angle 12 and Angle 15 are also same-side exterior angles. They lie on the same side of the transversal (line l) and outside of the two parallel lines (line m and line n).
Relationship between same-side exterior angles
Same-side exterior angles are supplementary angles, meaning that their sum is 180 degrees. This is because the two angles lie on the same side of a transversal and outside of two parallel lines, forming a straight angle.
Examples of same-side exterior angles in the real world
Same-side exterior angles can be found in many real-world situations, such as:
The angles formed when a railroad track crosses a road
The angles formed when a highway overpass crosses a road
The angles formed when a power line crosses a road